Explain @Controller and @RestController.

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In Spring MVC, @Controller and @RestController are annotations for defining request-handling classes, but they differ in output type.

• @Controller:
  Used for traditional web apps where methods return views (HTML, JSP, Thymeleaf). Data is passed via a Model. To return JSON/XML, methods must be annotated with @ResponseBody.

  @Controller
  public class HomeController {
      @GetMapping("/home")
      public String home(Model model) {
          model.addAttribute("msg", "Hello World");
          return "home";
      }
  }
  

• @RestController:
  Designed for REST APIs. It’s a combination of @Controller and @ResponseBody, so all methods return data directly (JSON/XML) instead of rendering views.

  @RestController
  public class ApiController {
      @GetMapping("/greet")
      public String greet() {
          return "Hello API";
      }
  }
  

Key difference: @Controller → views, @RestController → direct data (JSON/XML).

Read More :

How does Spring MVC handle web requests?

Explain @Controller and @RestController.

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